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- If the ducting has flaps, these must
be opened whenever the ventilation
hood is switched on.
Any constriction of the air throughput
will reduce extraction performance
and increase operating noise.
Ventilation stack
If the exhaust air is to be ducted into a
flue, the ducting must be directed in the
flow direction of the flue.
If the flue is used by several ventilation
units, the cross-section of the flue must
be large enough.
Non-return flap
Use a non-return flap in the vent
system.
A non-return flap ensures that when the
ventilation hood is not in operation, the
duct is closed to prevent unwanted
exchange of room air and outside air.
If the exhaust is ducted through an
outside wall, a Miele wall vent or roof
vent (available as an optional
accessory) is recommended. Both of
these have a built-in non-return flap.
If the on-site vent system does not have
a non-return flap, one is supplied with
the ventilation hood.
The non-return flap is installed in the
exhaust socket of the fan.
Condensate
If the ducting is to run through cool
rooms or ceiling space, for example, the
significant variations in temperature
between the different areas can cause
condensate to form. Insulate the
ducting to reduce temperature
variations.
If the ducting is to be laid horizontally, it
must be laid with a downwards sloping
gradient of at least ³/₈" (1 cm) per meter.
This is to ensure that condensate cannot
drain back into the ventilation hood.
In addition to insulating the ducting, it is
advisable to also install a condensate
trap for collecting and evaporating any
potential condensate.
Condensate traps for 5" (125 mm) or
6" (150 mm) diameter ducting are
available as optional accessories.
When installing a condensate trap,
ensure that it is positioned vertically
and as closely as possible to the
ventilation hood above the exhaust
vent. The arrow on the casing indicates
the direction of airflow.
Installation
39
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